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Wireless sensor networks have drawn considerable attention among researchers for providing a low-cost framework for Intelligent Transport Systems. Coverage problem in wireless sensor networks measures quality a region or parts of it is sensed by the sensors. Definition of coverage metric depends on the applications for which sensors are deployed. In this paper, we introduce a new quality control metric/measure called road coverage to partially cover road networks. It can be used for measuring the efficiency of a sensor network, which is deployed for tracking moving/mobile objects in a road network. First, we propose different definitions of road coverage metrics. It is shown that the problem of deploying minimum number of sensors to achieve road coverage is NP-hard. It motivates to design centralized approximate solution. For axis-parallel road segments constant factor approximation algorithms are proposed for finding proper sensors positions. Experimental performance analyses of our algorithms are carried out through extensive simulations.

Approximation Algorithms for Road Coverage Using Wireless Sensor Networks for Moving Objects Monitoring